diff --git a/libs/music/piano.ts b/libs/music/piano.ts
index e20e80f2..daaeba7e 100644
--- a/libs/music/piano.ts
+++ b/libs/music/piano.ts
@@ -12,6 +12,7 @@ namespace music {
     //% useEnumVal=1
     //% weight=10 blockGap=8
     export function noteFrequency(name: Note): number {
+        //TODO fill in actual min/max note values
         return name;
     }
 }
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